Table 2 The pregnant women’s vitamin D status in the first (T1) and third (T3) trimester of pregnancy, and their characteristics (mean or percent) grouped by 25OHD concentration in (T1)
T1 25OHD (nmol/L) | < 30 | 30–49.9 | 50–74.9 | 75–99.9 | ≥ 100 |
N | 198 | 291 | 788 | 565 | 125 |
% | 10.1 | 14.8 | 40.1 | 28.7 | 6.4 |
BMI T1 (kg/m2) | 25.1 | 24.9 | 24.4 | 23.9 | 24.4 |
Age T1 (years) | 29.4 | 30.9 | 31.6 | 32.0 | 32.4 |
Born in Sweden (%) | 14.1 | 54.6 | 83.3 | 87.8 | 93.5 |
Tobacco use T1 (%) | 6.8 | 4.6 | 4.0 | 4.6 | 1.6 |
Nulliparous T1 (%) | 34.8 | 42.0 | 42.6 | 43.1 | 42.7 |
Vitamin D supplement use T1 (%) | 10.6 | 28.2 | 45.2 | 56.6 | 62.9 |
University level education (%) | 32.3 | 54.9 | 61.3 | 67.3 | 66.1 |
Small for gestational age (%) | 5.7 | 4.2 | 5.3 | 4.1 | 4.0 |
Preterm delivery (%) | 4.1 | 5.2 | 3.8 | 3.9 | 1.6 |
Low birth weight (%) | 3.0 | 4.5 | 3.1 | 2.1 | 1.6 |
Pregnancy loss (%) | 6.3 | 5.6 | 4.5 | 5.1 | 0 |
T3 25OHD (nmol/L) | < 30 | 30–49.9 | 50–74.9 | 75–99.9 | ≥ 100 |
N | 163 | 330 | 473 | 409 | 443 |
% | 9.0 | 18.2 | 26.0 | 22.5 | 24.4 |
Small for gestational age (%) | 7.5 | 5.5 | 4.7 | 4.6 | 2.3 |
Preterm delivery (%) | 4.3 | 1.2 | 3.6 | 2.2 | 1.6 |
Low birth weight (%) | 4.3 | 0.3 | 2.7 | 1.2 | 1.4 |